thanks for any help...just bought an 85 70 atc from vegas style.......and when I took the cylinder head off, i noticed where the exaust bolts on there is like a wedge like piece missing from the casting...Is that normal, or is that a problem.......So where the flange bolts to the cylinder, the casting almost looks thin, and has a little piece missing and thin.....hope it makes sense.....the other head i have looks the same, did not know if that is normal, or a wear part for them....